<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8"/>
<title>登录</title>
</head>
<body>
 <div th:if="${param.error}">无效的账号和密码</div>
 <div th:if="${param.logout}">你已注销</div>
<form th:action="@{/login}" method="post">
    <div><label>账号：<input type="text" name="username"/></label></div>
    <div><label>密码：<input type="password" name="password"/></label></div>
    <div><input type="submit" value="登录"/></div>
</form>
</body>
</html>